Lower Pennsylvanian

Lower Pennsylvanian

[′lō·ər ‚pen·səl′vā·nyən]
(geology)
The earliest epoch of the Pennsylvanian period of geologic time, beginning about 310,000,000 years ago.
References in periodicals archive ?
The Morton 23-3 has been plugged back and perforated in the lower Pennsylvanian.
The area has potential for multiple pay zones as well as natural gas in structural accumulations and potential for Pierre or Niobrara shale gas, and may have potential in lower Pennsylvanian black shales in an elevator basin setting, similar to the ongoing plays in Guadalupe and San Miguel Counties, NM.
The Lower Pennsylvanian Massillon Sandstone has the longest history of usage; from the early 1800s to the present.
PHX is participating with a working interest in a newly developing deeper lower Pennsylvanian age Spiro, Wapanucka and Cromwell trend in the western half of the Arkoma Basin within Oklahoma's coal bed methane area.
Sedimentary environments of the Lower Pennsylvanian Sharon Conglomerate near Akron, Ohio.
The overlying Lower Pennsylvanian rocks consist of quartz sandstones, aluminum-rich clays, and thick coals, which indicate more humid conditions (Phillips and Peppers 1984; Cecil 1990; Miller and Eriksson 1999).
Monocylic Psaronius from the Lower Pennsylvanian of the Illinois Basin.
The Lindsea Bea Conglomerate formation is from the Lower Pennsylvanian System, a major producing deltaic movement within the study area.